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Pension and Other Postretirement Benefit Plans | 3 Months Ended
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Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Pension and Other Postretirement Benefit Plans [Text Block] | PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS
| Pension |  | Other Postretirement
Components of Net Periodic Benefit Expense (Income) | 2016 |  | 2015 |  | 2016 |  | 2015
Millions |  |  |  |  |  |  |
Three Months Ended March 31, |  |  |  |  |  |  |
Service Cost |  | $2.0 |  |  |  | $2.5 |  |  |  | $1.0 |  |  |  | $1.1 |
Interest Cost | 8.1 |  |  | 7.5 |  |  | 1.9 |  |  | 1.8 |
Expected Return on Plan Assets | (10.6 | ) |  | (10.2 | ) |  | (2.8 | ) |  | (2.7 | )
Amortization of Prior Service Credits | — |  |  | — |  |  | (0.7 | ) |  | (0.8 | )
Amortization of Net Loss | 2.4 |  |  | 4.5 |  |  | — |  |  | 0.1 |
Net Periodic Benefit Expense (Income) |  | $1.9 |  |  |  | $4.3 |  |  | $(0.6) |  | $(0.5)
Employer Contributions. For the three months ended March 31, 2016 and 2015, no contributions were made to our defined benefit pension plan; we expect to make $2.0 million in contributions to our defined benefit pension plan in 2016. For the three months ended March 31, 2016 and 2015, we made no contributions to our other postretirement benefit plan; we do not expect to make any contributions to our other postretirement benefit plan in 2016.

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